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Item Operation flow and applicable data, etc. Description
2. Indoor fan
motor
control
Cool air discharge preventive control
1) In heating operation, the indoor fan is controlled based on the
detected temperature of Tc sensor or Tcj sensor. As shown below,
the upper limit of the revolution frequency is restricted.
However B zone is assumed as C zone for 6 minutes and after when
the compressor activated. In defrost operation, the control value of
Tc is shifted by 6°C.
In D and E zones, the
priority is given to air volume
selection setup of remote
controller.
In A zone while thermo is
ON, [PRE-HEAT (Heating
ready)] is displayed.
3. Capacity
control
The cooling or heating capacity depending on the load is adjusted.
According to difference between the setup value of temperature and the
room temperature, the capacity is adjusted by the compressor revolution.
1) The difference between set
temperature on remote
controller (Ts) and room
temperature (Ta) is
calculated.
2) According to the
temperature difference, the
correction value of Hz
signal which determines
the compressor speed is
set up.
3) The rotating position and
speed of the motor are
detected by the
electromotive force
occurred on the motor
winding with operation of
the compressor.
4) According to the difference
resulted from comparison
of the correction value of
Hz signal with the present
operation Hz, the inverter
output is varied.
5) Change the compressor
motor speed by outputting
power to the compressor.
* The contents of control
operation are same in
cooling operation and
heating operation
(˚C)
32
30
28
26
20
16
Tc
Tcj
HH
H
L
UL
OFF
E zone
D zone
C zone
B zone
A zone
Set temp. (Ts)
Remote controller
Indoor unit
Room temp. (Ta)
Ts –Ta
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor speed and rotor position
Correction value of Hz signal ≤ Operating Hz
Inverter output change
Change of compressor speed
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